CN106941731A - NAV methods to set up and relevant device in wireless communication system - Google Patents
NAV methods to set up and relevant device in wireless communication system Download PDFInfo
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- CN106941731A CN106941731A CN201610006493.9A CN201610006493A CN106941731A CN 106941731 A CN106941731 A CN 106941731A CN 201610006493 A CN201610006493 A CN 201610006493A CN 106941731 A CN106941731 A CN 106941731A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
Abstract
The invention provides NAV methods to set up and its relevant device in a kind of wireless communication system, STA or AP receives the 2nd PPDU, wherein, 2nd PPDU and the first PPDU comes from same OBSS, wherein, first PPDU is to be received before the 2nd PPDU by the STA or AP, wherein, the STA or AP current NAV is updated based on the first PPDU；If the STA or AP meets the condition of concurrent transmission that allows, the STA or AP ignore the current NAV, carry out concurrent transmission.
Description
Technical field
The present embodiments relate to communication technical field, and more particularly, in wireless communication system
NAV methods to set up and relevant device.
Background technology
With the development and the popularization of intelligent terminal of mobile Internet, data traffic shows the increasing of explosion type
Long trend.WLAN (Wireless Local Area Network, WLAN) is by it at a high speed
One of advantage in terms of rate and low cost, mobile broadband access technology as current main flow.
Based on Institute of Electrical and Electric Engineers (Institute of Electrical and Electronics
Engineers, IEEE) formulated based on 802.11 agreements (802.11a/g/n/ac of such as main flow)
WLAN in, can include multiple Basic Service Sets (Basic Service Set, BSS), each BSS
In can include access point (English：Access Point, referred to as：AP website) and one
Or website (the English of multiple non-access point classes associated with the AP：None Access Point Station,
Referred to as：Non-AP STA), Non-AP STA are referred to as STA as follows.
In the WLAN based on 802.11 agreements, the access control scheme of wireless medium resource is mainly adopted
With distributed coordination function (Distributed Coordination Function, DCF).Under DCF patterns,
Wireless medium is that the occupancy of wireless channel is used based on Carrier Sense Multiple Access/conflict avoidance
The competition of (Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA)
Mechanism.STA or AP first listens to channel status before data are sent, if channel duration is idle one section
Time, then carry out random back, if keep out of the way end channel it is still idle, can really start data
Transmission.
It is used as judging that the carrier sense of channel busy-idle condition is divided into Physical carrier sense in DCF
(Physical Carrier Sensing, PCS) and virtual carrier sensing in wireless network communication (Virtual Carrier Sensing,
VCS) two ways.Clear channel assessment (CCA) (the Clear Channel that PCS result is provided with physical layer
Assessment, CCA) represent, and CCA be generally based on signal detection (Signal Detection,
) or bag detection (Packet Detection, PD) thresholding and/or energy measuring (Energy Detection) SD
Thresholding judges the busy-idle condition of present channel.When CCA results are higher than a certain given thresholding, then recognize
It is busy for channel status, is then the free time on the contrary.What deserves to be explained is, for based on SD's or PD
CCA, STA or AP can be distinguished pair by setting different CCA thresholdings so as to " tight inside but loose outside "
Wait to come from local BSS and overlapping BSS (Overlapping BSS, OBSS) signal.Wherein,
OBSS is also referred to as Inter BSS, usually, and mac frame can be in physical layer by adding physics packet header or leading quilt
Be encapsulated as PPDU, STA or AP can by media access control (Media Access Control,
MAC address information) in frame frame head or the physical layer convergence procedure (Physical for carrying the mac frame
Layer Convergence Procedure, PLCP) protocol Data Unit (PLCP Protocol Data Unit,
PPDU packet header) or it is leading in signaling domain in the BSS marks (BSS in such as HE-SIG-A
Color colour codes) come judge one receive PPDU whether come from local BSS or OBSS.
VCS sets network allocation vector (Network by the Duration fields in mac frame frame head
Allocation Vector, NAV) complete, the initial times of Duration periods is carries
The PPDU end of transmission moment of the Duration information.NAV can be understood as a Timer counting
Device, represent channel also want it is occupied how long, each monitor STA or AP maintain a NAV
Counter (software or hardware are realized).NAV value elapses continuous reduction over time, in NAV values
Before reducing to zero (even if CCA results are the free time), STA or AP think that wireless channel is busy and stops all the time
Only channel competition and data are sent.
Communication link transmitting station (including STA or AP) and/or receiving station (including STA or
AP) can be by setting the Duration fields in the mac frame frame head that it sends come to neighbours STA
Or AP broadcast its reserved channel use time or current transmission chance (Transmit Opportunity,
TXOP remaining time).Usually, PPDU purpose receiving station (including STA or AP) is
Itself NAV counter is updated without the Duration information in the PPDU.Meanwhile, place
Other websites (including STA or AP) around communication link are needed according to the mac frame received
In Duration fields numerical values recited come judge whether update the NAV counters of itself, work as reception
The Duration numerical value arrived is more than itself current remaining count value of NAV counters, then is receiving
NAV count values are set to after the PPDU ends of transmission represented by the Duration fields that newly receive
Count value.Special instruction, in current 802.11ax standard discussions, in PPDU packet header
Can be comprising a TXOP field in the signaling symbols of (also referred to as leading), it is to indicate current TXOP
In still remaining transmission time.It is functionally equivalent to also placed a Duration field in physical layer.
That is, STA or AP can be by the TXOP in the physics packet header signaling of the PPDU in transmission
And/or the Duration information in entrained mac frame frame head come to neighbours STA or AP notify or
Update the STA or AP NAV counters.It is appreciated that in the signaling of PPDU physics packet header
Duration fields in TXOP fields and mac frame frame head are referred to as NAV Duration.
Obviously, above-mentioned NAV settings and the existing rule updated are effectively guaranteed the letter in adjacent domain
The unicity that road is used, it is to avoid interfering and collide between transmission link.But which also limits neighbouring
Concurrent number of links in region so that network area handling capacity is difficult to further lifting.It is of future generation
802.11 agreement 802.11ax introduce space multiplexing technique to lift the WLAN level of resources utilizations.
STA or AP can improve CCA threshold values, so original link that can not simultaneously and concurrently transmit, can be with
Concurrent transmission spatially is carried out, so as to lift network throughput.But in WLAN deployment increasingly
Under intensive trend, if continuing to continue to use current NAV renewal rules, dense deployment can not be played
Advantage, also can not just meet growing business demand.
The content of the invention
The embodiment of the present invention provides NAV methods to set up and relevant device, energy in a kind of wireless communication system
Improve throughput of system.
First aspect present invention provides NAV methods to set up, this method bag in a kind of wireless communication system
Include：STA or AP receives the 2nd PPDU；2nd PPDU and the first PPDU is from same
OBSS, wherein, the first PPDU is to be received before the 2nd PPDU by the STA or AP；
Wherein, the NAV current STA or AP is updated based on the first PPDU；If the STA
Or AP meets the condition of permission concurrent transmission, then the STA or AP ignore the current NAV, carry out
Concurrent transmission.
Second aspect present invention provides a kind of STA or AP, and it includes：Receiver, for receiving the
Two PPDU, wherein, the 2nd PPDU and the first PPDU come from same OBSS, wherein, should
First PPDU is to be received before the 2nd PPDU by the STA or AP；Wherein, the STA
Or the current NAV of AP are updated based on the first PPDU；And, processor, if for being somebody's turn to do
STA or AP, which is met, allows the condition of concurrent transmission, then the STA or AP ignore the current NAV,
Carry out concurrent transmission.
NAV mechanism under major design of the present invention concurrent transmission, can increase the spatial reuse energy of system
Power, lifts whole net handling capacity.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be in the embodiment of the present invention
The required accompanying drawing used is briefly described, it should be apparent that, drawings described below is only this
Some embodiments of invention, for those of ordinary skill in the art, are not paying creative work
Under the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram for being applicable communication system according to embodiments of the present invention.
Fig. 2 is the flow chart of the NAV methods to set up in wireless communication system in the embodiment of the present invention one.
Fig. 3-5 is the PPDU of 802.11ax forms in the embodiment of the present invention one different frame topology example
Figure.
Fig. 6-10 is time diagram of the embodiment of the present invention on NAV.
Figure 11 is the composition figure of communication node in the embodiment of the present invention two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work on the premise of the every other embodiment that is obtained, should all belong to the scope of protection of the invention.
The embodiment of the present invention can apply to that multiple BSS, BSS can be included in WLAN, WLAN
In can include an AP and one or more STA associated with the AP.
AP, also referred to as wireless access points or focus etc..AP is that mobile subscriber enters cable network
Access point, major deployments inside family, inside buildings and garden, typical covering radius be tens
Rice is to rice up to a hundred, it is of course also possible to be deployed in open air.AP is equivalent to a connection wired network and wirelessly
The bridge of net, its main function is to connect together each wireless network clients, then by wireless network
Network access network based on ethernet.
STA, can be wireless communications chips, wireless senser or wireless communication terminal.For example：Support
The mobile phone of WiFi communication function, the panel computer for supporting WiFi communication function, support WiFi communication
The set top box of function, the intelligent television for supporting WiFi communication function, the intelligence for supporting WiFi communication function
Wearable device and the computer for supporting WiFi communication function.
At present, the main accepted standards of STA or AP are the series of IEEE 802.11.Specifically, STA
Or AP can be the equipment with WiFi (Wireless Fidelity, Wireless Fidelity) chip.Alternatively,
STA or AP can be the equipment for supporting 802.11ax standards, still optionally further, the STA or AP
Can be a variety of WLAN such as support 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a
The equipment of standard.
With the development of the communication technology, in order to improve the throughput of system under intensive scene, space is introduced
Multiplexing (English：Spatial Reuse, referred to as：SR) concept, certain scene or under the conditions of permit
Perhaps the communication link of two or more than two (that is, is made using identical running time-frequency resource within the same period
With same channel) it is transmitted.Specifically it can be understood as：STA or AP in local BSS are being detectd
Hear when having the PPDU for coming from OBSS on present channel, even if the signal intensity of the PPDU is higher than
- 82dBm, but is below OBSS PD thresholding OBSSCCA thresholdings either SR CCA
Limit, it is however generally that, OBSS PD thresholdings can meet -82dBm<OBSS PD thresholdings<- 62dBm, should
STA or AP in local BSS (such as, can not influence currently to carry out under certain condition
OBSS communications) carried out by certain means (such as, adjusting transmit power) to be multiplexed same channel
Spatial reuse link transmission.Citing, as shown in figure 1, AP1 sends downlink data (AP1 to STA1
Link between STA1 is properly termed as primary link) while, STA2 is complete using primary link
Portion or portion of time frequency resources and AP2 carry out transmitting uplink data, and (link between AP2 and STA2 can be with
Referred to as spatial reuse link).So-called primary link and spatial reuse link are a relative concepts, primary
There is the transmission time of common factor or spatial reuse link in transmission time in link and spatial reuse link
It is the subset of primary link transmission times.One link A is for another chain starting during its transmission
For the B of road, if link B transmitting terminal STA or AP is in link A transmitting terminal STA or AP
Or/and within receiving terminal STA or AP effective communication distance, and link B has used link A complete
Portion or partial running time-frequency resource, it is possible to claim the primary link that link A is link B；Corresponding,
Link B is exactly spatial reuse link for link A.Usually, primary link can be up
Transmission link (transmission i.e. from STA to AP) or downlink transfer link (i.e. from AP to
STA transmission), Fig. 1 gives the situation of primary downlink transmission.Spatial reuse link can also
It is uplink either downlink transfer, Fig. 1 is illustrated with the up example that is transmitted as, and spatial reuse
Link is normally at the BSSs different with primary link.Usually, different BSS PPDU can be carried
Different BSS marks, BSS marks can be the BSS colors in the leading signaling domains of PPDU,
Or, can be the BSS identifiers in the address field in the mac frame frame head that is carried in PPDU
BSSID, it is possibility to have other forms of expression.
In order to be able to spatial reuse/concurrent transmission, had agreed in current 802.11ax standard discussions when satisfaction
During certain concurrent condition, the NAV information in OBSS PPDU can be ignored, concurrently to pass
It is defeated.It is specific to discuss that description has following two sections of words：
1) as OBSS PPDU received signal strength indicator (Received Signal Strength
Indication, RSSI) it is less than the presently used OBSS PD thresholdings of STA or AP, and meeting
It is some it is undetermined under the conditions of, the STA or AP can consider and do not received at all the OBSS PPDU,
So as to also with regard to updating the NAV of itself without the NAV Duration information in the OBSS PPDU
Counter.Compared to the standard before 11ax, this just relaxes the rule that NAV sets and updated so that
STA or AP have the channel that more chance demultiplexing OBSS are being used.
English can be：
A STA should regard an Inter-BSS PPDU with a valid PHY header and that
has a receive power/RSSI below the OBSS PD level used by the receiving STA
and that meets additional TBD conditions,as not having been received at all(e.g.,
should not update its NAV),except that the medium condition shall indicate
BUSY during the period of time that is taken by the receiving STA to validate
that the PPDU is from an Inter-BSS,but not longer than the time indicated as the
length of the PPDU payload.The OBSS PD level is greater than the minimum
receive sensitivity level.
2) on the basis of 1), it is further noted that STA or AP can by reduce transmission power come
OBSS PD thresholdings used in lifting.If that is, the STA or AP has the ability with lower
Power be transmitted, then it can judge OBSS PPDU with higher OBSS PD thresholdings.From
And, the STA or AP can ignore higher RSSI OBSS PPDU, and increase channel is judged as sky
Between probability, improve the concurrent chance of spatial reuse.
English can be：
An 11ax STA regards a valid OBSS PPDU as not having been received at all
(e.g.,should not update its NAV),except that the medium condition shall indicate
BUSY during the period of time that is taken by the receiving STA to validate
that the PPDU is from an Inter-BSS,but not longer than the time indicated as the
length of the PPDU payload if the RXPWR of the received PPDU is below the
OBSS_PD threshold and TBD conditions are met,noting that the OBSS_PD
threshold is accompanied by a TXPWR value and a reduction in the TXPWR
may be accompanied by an TBD increase in the OBSS_PD threshold value.
It is preceding to have addressed, NAV Duration information included in a PPDU (whether physics bag
TXOP fields in head signaling domain or the Duration fields in mac frame frame head) the term of validity
The finish time of initial time exactly PPDU transmission.Then, as shown in Figure 6, although receive STA
Or AP can ignore OBSS PPDU1 NAV1 (PPDU1 here may be considered second
PPDU, the similar understanding of description below, is repeated no more), but if it is receiving the OBSS PPDU1
The NAV0 count values at (T0 moment) are not 0 before, and judge institute in the reception STA or AP
(a certain moment between T0 and T1), the NAV0 when stating PPDU1 for same OBSS PPDU
0 is not reduced to yet, then the STA or AP will reduce to 0 moment (T2 moment) when the NAV0 always
The channel competition of concurrent transmission could be started.Especially, if the NAV0 is in the OBSS PPDU1
The end of transmission moment (T1 moment) does not reduce to 0 yet, although the then NAV1 of the OBSS PPDU1
Information has been ignored, but the STA or AP still can not start concurrent transmission.
In fact, if the NAV0 be set by the PPDU0 from same OBSS/update (this
In PPDU0 may be considered the first PPDU, following description is similar to be understood, is repeated no more), then
The STA or AP originally can without just starting concurrent transmission when the NAV0 reduces to 0,
And just start concurrent transmission after same OBSS can be come from judging the PPDU1.It can this
The reason for sample is done is that PPDU0 and PPDU1 one in front and one in back is described both from same OBSS
The judgement and decision that can be concurrent that STA or AP makes according to PPDU1, must can match institute
State OBSS newest/current transmission state.If that the STA or AP are in PPDU1
Transmission during and/or its NAV1 term of validity in initiate concurrent transmission (it is assumed that meet it is some it is specific simultaneously
Clockwork spring part), transmission that can't be to PPDU0 (in fact PPDU0 has been passed before PPDU1)
And/or its NAV0 term of validity is impacted with the communication in the overlapping period of the NAV1 terms of validity.
In a word, in the previous case, it is impossible to STA or AP is started concurrent transmission earlier, it is impossible to most
The chance of the utilization channel concurrent transmission of limits.
Therefore, how make it that potential concurrent STA or AP in the case of current NAV non-zeros, are sentencing
Break and start concurrent transmission as early as possible when to meet the concurrent condition of spatial reuseCan be regular by changing NAV,
So that potential concurrent STA or AP at some in particular cases, can not only ignore in current PPDU
NAV information, and the NAV count values itself being set can be ignored, concurrent transmission is initiated as early as possible,
Improve the efficiency of spatial reuse.
Embodiment one：
Referring to Fig. 1, the embodiments of the invention provide NAV methods to set up in a kind of wireless communication system,
Comprise the following steps：
S01：STA or AP receives the 2nd PPDU, wherein, the 2nd PPDU and the first PPDU
From same OBSS, wherein, the first PPDU be before the 2nd PPDU by the STA or
What AP was received, wherein, the STA or the current NAV of AP are updated based on the first PPDU；
S02：If the STA or AP, which is met, allows the condition of concurrent transmission, the STA or AP are neglected
The slightly current NAV, carries out concurrent transmission.
Certain STA or AP can be preserved for triggering the OBSS PPDU for setting or updating NAV
In entrained BSS marks, such as BSS color or MAC in PPDU physical preambles signaling domain
In frame address field BSS ID (BSS ID can be carried at transmission address in MAC Address domain or
In person's destination address field).By compare BSS mark, judge recently received PPDU whether with
The PPDU of NAV for triggering the last setting/renewal comes from same OBSS.These actions
It can be supplemented as STA or AP action, although not described in S01 or S02.
Alternatively, it is specially one of following several ways to ignore the current NAV：
Mode one：
If the finish time of the current NAV is earlier than or equal to corresponding to the 2nd PPDU
TXOP or the NAV Duration of carrying finish time, then ignore the current NAV；
It is above-mentioned earlier than or the situation that is equal to can see the example shown in Fig. 6-Fig. 8.Fig. 6 show NAV0
Finish time be later than at the beginning of NAV1 and carve and the finish time earlier than NAV1, Fig. 7 is shown
NAV0 finish time, Fig. 8 showed NAV0 finish time before quarter at the beginning of NAV1
It is identical with NAV1 finish time.
In general, Fig. 6-Fig. 8 examples are not limited to, STA or AP are received before the T0 moment to be come
Itself is have updated from OBSS0 PPDU0, and based on the NAV information NAV0 in PPDU0
NAV count values.The STA or AP in T0 receptions to PPDU1, and in PPDU1 transmission
A certain moment T2 ', the STA or AP before finish time T1 detect PPDU1 and come from
OBSS1, then under conditions of concurrent transmission is met, the STA or AP can ignore institute in PPDU1
Comprising NAV information NAV1 (without updating itself NAV according to NAV1).On this basis,
If OBSS0 and OBSS1 are same OBSS, and NAV0 finish time after T2 ', then
The STA or AP can further ignore the NAV0 between moment T2 ' and the NAV1 term of validity cut-off time
Count.Then, the STA or AP is after moment T2 ' or its and NAV0 is counted before reducing to 0
The a certain moment can just start concurrent transmission (if NAV0 has reduced to 0 before the T2 ', need not
This case is invented, and the STA or AP can just start concurrently according to the rule in existing standard after T2 '
Transmission), without restarting concurrent transmission after the wait T2 moment.
Mode two：
If the finish time of the current NAV is later than or equal to corresponding to the 2nd PPDU
TXOP finish time or the NAV Duration of carrying finish time, then ignore the current NAV
Until the 2nd PPDU corresponding to TXOP finish time or carrying NAV Duration knot
The beam moment.
NAV0 finish time is illustrated in figure 9 after NAV1 finish time.
With reference to Figure 10, it is more directly perceived for the sake of, the PPDU0 in embodiment one and PPDU1 is had
Body turns to the Trigger trigger frames (Trigger Frame, be denoted as TF) introduced in 802.11ax, also
It is to be appreciated that PPDU0 is TF0, PPDU1 is TF1.Provide the STA gone for such as Fig. 6-9
Or AP NAV updates the workflow with concurrent transmission, although the NAV0 for the citing that Figure 10 is drawn
With NAV1 and NAV0 ' with NAV finish time it is simple be depicted as finish time.
STA0 listens to the trigger frame TF0 for coming from OBSS AP (for adjusting first in local BSS
OBSS STA1 uplink is spent, wherein STA1 can refer to a STA, can also refer to one group of STA),
It is assumed that the RSSI that TF0 is reached at STA0 is not less than the OBSS PD thresholdings that STA0 is used, or
STA0 can not meet the condition (if any) of permission concurrent transmission entrained in TF0, STA0
NAV information NAV0 according to entrained by TF0 is updated to the NAV of itself (it is assumed that being taken in TF0
The NAV0 of band is more than STA0 itself NAV), the NAV of the STA0 after renewal finish time is
T2.Meanwhile, which OBSS STA0 records trigger this NAV renewals PPDU under preserving comes from
Information.
According to existing rule, scheduling of the OBSS STA1 in TF0 is indicated, sends upstream data (UL
PPDU_1), while the NAV information NAV0 ' in PPDU_1 is set at the end of the PPDU_1
Quarter starts to the time span between the T2 moment.If STA0 have received PPDU_1, it need not
The NAV of itself is updated according to NAV information entrained in PPDU_1, because in PPDU_1
NAV0 ' numerical value is not more than synchronization STA0 NAV.
After the PPDU_1 ends of transmission, OBSS AP have sent another in current TXOP again
Trigger frame TF1, it is assumed that the RSSI for the TF1 that STA0 is received is less than the OBSS PD that STA0 is used
Thresholding (such as OBSS AP reduce the power for sending TF1), or STA0 can be met in TF1
The condition of entrained permission concurrent transmission is (if any, because what TF0 and TF1 may be dispatched
Uplink user is different, so the condition of its permission concurrent transmission carried may also be different), then according to most
New 11ax standards, STA0 can be as TF1 not be received, so as to be taken without going to comprehend in TF1
The NAV information NAV1 of band.But because STA0 NAV is not 0, STA0 before the T2 moment
Concurrent transmission can not be started before the T2 moment.
If in fact, STA0 is judging that TF1 comes from OBSS or and after meeting spatial reuse condition
(T2 ' moment), it is that the transmission (such as PPDU_2) in OBSS will not be caused to start concurrent transmission
Interference.According to the method in embodiment one, STA0 judges that itself NAV updates oneself and TF1 identicals
OBSS, then STA0 can ignore the NAV of itself since the T2 ' moment, until NAV1 knot
The beam moment (in Figure 10, NAV1 finish time is identical just with NAV0 finish time).Then,
STA0 just can be before the T2 moment sometime (such as T2 ') start-up space multiplexing concurrent transmission.
Alternatively, the STA or AP also includes before concurrent transmission is carried out：The STA or AP is carried out
Channel competition carries out the transmission opportunity of concurrent transmission to obtain.
Alternatively, the condition of the permission concurrent transmission includes：If CCA the doors current STA or AP
Limit value is set greater than some preset value, when the STA or AP detects the 2nd PPDU received
RSSI be less than or equal to the current CCA threshold values of the STA or AP or improve after CCA thresholdings
Value；Or the STA or AP is in idle (CCA idle) states of CCA or STA the or AP institutes
The concurrent transmission link of potential foundation is a near point communication link or the 2nd PPDU middle fingers received
Showing allows at least one or more than one the combination when concurrent transmission.
Alternatively, for the transmission between the AP in the local BSS belonging to a STA and a STA
Link (either uplink or downlink transfer), if meeting one or a combination set of following condition,
Then the transmission link between the AP and the STA can be referred to as near point communication link：
The STA and AP distance is less than or less than or equal to default threshold value；
Or,
The RSSI for the PPDU transmitted by the AP that the STA is received is more than or more than or equal to default
RSSI critical values；
Or,
The RSSI that the AP receives the PPDU transmitted by the STA is more than or more than or equal to default
RSSI critical value.
Alternatively, indicate to allow concurrent transmission to specifically include in the 2nd PPDU received：
In the PPDU of 802.11ax forms, can in HE-SIG-A or HE-SIG-B or
Mac frame frame head part increases by 1 bit SR allowed flag configured informations, indicates whether to allow simultaneously
Hair transmission；And/or；In the PPDU of Legacy forms, 1 can be increased in mac frame frame head
Individual bit SR allowed flag configured informations, indicate whether to allow concurrent transmission.
Specifically it is appreciated that as follows：
In PPDU (including data frame, RTS or CTS the or Trigger Frame of 802.11ax forms
Deng control frame, or management frame etc.) in, can HE-SIG-A or HE-SIG-B common part
(n is big to 1 bit of (common portion) or mac frame frame head increase SR allowed flag or n
In 1 integer) individual bit SR allowed flag, or some increased concurrent transmission field (SR
Field) (such as interference threshold Interference level or jamming margin Interference margin's) is special
It is worth (such as complete zero or other particular value), indicates whether to allow concurrent transmission；And/or
In the PPDU of Legacy forms (such as RTS or CTS or Trigger frame control frames,
Or management frame etc.), 1 bit SR allowed flag or n (n can be increased in mac frame frame head
For the integer more than 1) individual bit SR allowed flag, or some increased concurrent transmission field
(SR field) (such as interference threshold Interference level or jamming margin Interference margin)
Particular value (such as complete zero or other particular value), indicate whether allow concurrent transmission；
Wherein, particular locations of the SR allowed flag in PPDU can be found in Fig. 2-4.
Alternatively, the PPDU of the 802.11ax forms includes data frame, RTS or CTS or Trigger
The control frames such as Frame or management frame；The PPDU of the Legacy forms include RTS or CTS or
The control frames such as Trigger frame or management frame.
Still optionally further, CCA thresholdings, can be detection of preamble (Preamble Detection) thresholding,
Or signal detection (Signal Detection) thresholding or bag detection (Packet Detection) thresholding or energy
It is one or more in amount detection (Energy Detection) thresholding or WiFi signal detection threshold
Combination.
Still optionally further, the preset value can be minimum or default detection of preamble or signal detection or
Bag detection threshold value；It can also be default or minimum energy measuring threshold value；Can be it is default or
Minimum WiFi signal detection threshold value；It may also be other predetermined threshold values.
Specifically it is appreciated that as follows：
Wherein, the preset value can be default or minimum detection of preamble/signal detection/bag detection threshold
Value is (under such as 20MHz system bandwidths, for-the 82dBm of acquiescence；Or under 40MHz system bandwidths, be
- 79dBm), can specifically refer to solve signal it is leading in the case of the threshold value that uses；Can also be
Default or minimum energy measuring threshold value (under such as 20MHz system bandwidths, for-the 62dBm of acquiescence),
Can specifically refer to can not solve signal or can not solve signal it is leading in the case of the threshold value that uses；
Can be that default or minimum WiFi signal detection threshold value (is silent under such as 20MHz system bandwidths
- the 72dBm recognized), can specifically refer to can not solve signal it is leading but can be judged as WiFi or
The threshold value used in the case of 802.11ax signals；It may also be other predetermined threshold values.
Alternatively, judge whether the PPDU of the reception comes from OBSS method and include：According to
Whether BSS color fields in HE-SIG-A judge the PPDU of the reception from OBSS, or according to
The reception address (RA) in MAC packet header or send address (TA) come judge the reception PPDU whether
From OBSS.
Alternatively, the first PPDU and the 2nd PPDU STA or AP in WLAN
OBSS。
Wherein, the current NAV can be the STA or AP for coming from local BSS, and,
The STA or AP all OBSS PPDU and set or for coming from the STA
Or AP all OBSS PPDU and set, can also be for coming from the STA or AP
Some or a certain group of OBSS PPDU and set.
Embodiment two
Referring to Fig. 5, the embodiment of the present invention additionally provides STA or AP 100, including receiver 101
With processor 103.Alternatively include transmitter 102.Still optionally further, including memory 104.Enter
One step is it is alternatively possible to including bus.
Receiver, for receiving the 2nd PPDU, wherein, the 2nd PPDU and the first PPDU comes from
Same OBSS, wherein, the first PPDU is to be received before the 2nd PPDU by communication node
's；Wherein, the current NAV of the communication node is updated based on the first PPDU；And
Processor, if being met for the communication node allows the condition of concurrent transmission, the communication node
Ignore the current NAV, carry out concurrent transmission.
Alternatively, the processor is current specifically for ignoring this according to one of following several ways
NAV：
If the finish time of the current NAV is earlier than or equal to corresponding to the 2nd PPDU
TXOP finish time or the NAV Duration of carrying finish time, then ignore this current
NAV；
If the finish time of the current NAV is later than or equal to corresponding to the 2nd PPDU
TXOP finish time or the NAV Duration of carrying finish time, then ignore the current NAV
Until the 2nd PPDU corresponding to TXOP finish time or carrying NAV Duration knot
The beam moment.
Alternatively, the condition of the permission concurrent transmission includes：If the current CCA thresholdings of the communication node
Value is set greater than some preset value, when the communication node detects the 2nd PPDU's received
The CCA threshold values that RSSI is less than or equal to after the current CCA threshold values of the communication node or raising；
Or the communication node is in the potential foundation of idle (CCA idle) states of CCA or communication node institute
Concurrent transmission link to indicate to allow simultaneously in a near point communication link or the 2nd PPDU that receives
At least one or more than one combination when hair transmission.
Alternatively, the PPDU of the 802.11ax forms includes data frame, RTS or CTS or Trigger
The control frames such as Frame or management frame；The PPDU of the Legacy forms include RTS or CTS or
The control frames such as Trigger frame or management frame.
Alternatively, the OBSS of the first PPDU and the 2nd PPDU communication nodes in WLAN.
The communication node is AP or STA.
Wherein, the current NAV can be the communication node for coming from local BSS, and,
All OBSS of communication node PPDU and set or only for coming from the communication
All OBSS of node PPDU and set, can also be only for coming from the communication node
Some or a certain group of OBSS PPDU and set.
The description of above method embodiment can be applicable the communication node embodiment, will not be repeated here.
In embodiments of the present invention, the processor 103 can be used for performing above-mentioned steps S02, the memory
104 are used to store the program and data needed for the processor 103 execution above-mentioned steps.
In above-described embodiment symbol/expression or relation, A and/or B represent three kinds of situations：A, B, A
And B.
Those of ordinary skill in the art are it is to be appreciated that with reference to each of the embodiments described herein description
The unit and algorithm steps of example, can be with electronic hardware or the knot of computer software and electronic hardware
Close to realize.These functions are performed with hardware or software mode actually, depending on the spy of technical scheme
Fixed application and design constraint.Professional and technical personnel can use not Tongfang to each specific application
Method realizes described function, but this realization is it is not considered that beyond the scope of this invention.
It is apparent to those skilled in the art that, it is for convenience and simplicity of description, above-mentioned to retouch
The specific work process of system, device and the unit stated, may be referred to the correspondence in preceding method embodiment
Process, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, device and
Method, can be realized by another way.For example, device embodiment described above is only to show
Meaning property, for example, the division of the unit, only a kind of division of logic function can when actually realizing
To there is other dividing mode, such as multiple units or component can combine or be desirably integrated into another
System, or some features can be ignored, or not perform.It is another, it is shown or discussed each other
Coupling or direct-coupling or communication connection can be the INDIRECT COUPLING of device or unit by some interfaces
Or communication connection, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, make
It can be for the part that unit is shown or may not be physical location, you can with positioned at a place,
Or can also be distributed on multiple NEs.Can select according to the actual needs part therein or
Person's whole units realize the purpose of this embodiment scheme.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit
In or unit be individually physically present, can also two or more units be integrated in one
In individual unit.
If the function is realized using in the form of SFU software functional unit and as independent production marketing or made
Used time, it can be stored in a computer read/write memory medium.Understood based on such, the present invention
The part that is substantially contributed in other words to prior art of technical scheme or the technical scheme portion
Dividing can be embodied in the form of software product, and the computer software product is stored in a storage medium
In, including some instructions to cause a computer equipment (can be personal computer, server,
Or the network equipment etc.) or processor (processor) execution each embodiment methods described of the invention
All or part of step.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage
(ROM, Read-Only Memory), random access memory (RAM, Random Access
Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited to
In this, any one skilled in the art the invention discloses technical scope in, can be easily
The change or replacement expected, should all be included within the scope of the present invention, therefore the protection of the present invention
Scope should be defined by scope of the claims.
Claims (12)
1. NAV methods to set up in a kind of wireless communication system, it is characterised in that this method includes：
STA or AP receives the second physical layer convergence procedure (Physical Layer Convergence
Procedure, PLCP) protocol Data Unit (PLCP Protocol Data Unit, PPDU)；
2nd PPDU and the first PPDU comes from same Overlapping Basic Service Set (Overlapping
Basic Service Set, OBSS), wherein, the first PPDU is before the 2nd PPDU
Received by the STA or AP；Wherein, the STA or AP current network configuration vector (Net
Allocation Vector, NAV) it is to be updated based on the first PPDU；
If the STA or AP, which is met, allows the condition of concurrent transmission, the STA or AP ignore
The current NAV, carries out concurrent transmission.
2. the method as described in claim 1, it is characterised in that ignore the current NAV specific
For one of following several ways：
If the finish time of the current NAV is earlier than or equal to corresponding to the 2nd PPDU
Transmission opportunity (Transmit Opportunity, TXOP) finish time or the NAV of carrying
Duration finish time, then ignore the current NAV；
If the finish time of the current NAV is later than or equal to corresponding to the 2nd PPDU
TXOP finish time or the NAV Duration of carrying finish time, then ignore described current
Finish times or the NAV Duration of carrying of the NAV up to the TXOP corresponding to the 2nd PPDU
Finish time.
3. method as claimed in claim 1 or 2, it is characterised in that the STA or AP are entering
Also include before row concurrent transmission：
The STA or AP carry out channel competition to obtain the transmission opportunity of progress concurrent transmission.
4. the method as described in above-mentioned claim any claim, it is characterised in that the permission
The condition of concurrent transmission includes：If the channel idle current STA or AP assesses (Clear Channel
Assessment, CCA) threshold value is set greater than some preset value, when the STA or AP are examined
Measure the 2nd PPDU received RSSI (Received Signal Strength Indication,
Received signal strength indicator) it is less than or equal to the current CCA threshold values of the STA or AP or raising
CCA threshold values afterwards；Or the STA or AP be in idle (CCA idle) states of CCA or
The STA or AP potential foundation concurrent transmission link is a near point communication link or receives
Indicate to allow at least one or more than one the group when concurrent transmission in 2nd PPDU
Close.
5. the method as described in any one claim of above-mentioned claim, it is characterised in that described
One PPDU and the 2nd OBSSs of the PPDU from STA described in WLAN or AP.
6. the method as described in above-mentioned claim any claim, it is characterised in that
The current NAV can be the STA or AP for coming from local BSS, and,
The STA or AP all OBSS PPDU and set or it is described for coming from
STA or AP all OBSS PPDU and set, can also be for coming from the STA
Or AP some or a certain group of OBSS PPDU and set.
7. a kind of communication node, including：
Receiver, for receiving the 2nd PPDU, wherein, the 2nd PPDU and the first PPDU comes
From same OBSS, wherein, the first PPDU is by described logical before the 2nd PPDU
Believe what node was received；Wherein, the current NAV of the communication node is to be based on the first PPDU more
New；And
Processor, if being met for the communication node allows the condition of concurrent transmission, the communication
Node ignores the current NAV, carries out concurrent transmission.
8. communication node as claimed in claim 7, it is characterised in that the processor specifically for
Ignore the current NAV according to one of following several ways：
If the finish time of the current NAV is earlier than or equal to corresponding to the 2nd PPDU
TXOP or carrying NAV Duration finish time, then ignore the current NAV；
If the finish time of the current NAV is later than or equal to corresponding to the 2nd PPDU
TXOP finish time or the NAV Duration of carrying finish time, then ignore described current
Finish times or the NAV Duration of carrying of the NAV up to the TXOP corresponding to the 2nd PPDU
Finish time.
9. the communication node as described in claim 7 or 8, it is characterised in that the permission is concurrent
The condition of transmission includes：Preset if the current CCA threshold values of the communication node are set greater than some
Value, when the communication node detect the 2nd PPDU received RSSI be less than or equal to institute
CCA threshold values after stating the current CCA threshold values of communication node or improving；Or at the communication node
In idle (CCA idle) states of CCA or the communication node potential foundation concurrent transmission chain
Indicate to allow the feelings such as concurrent transmission in Lu Weiyi near points communication link or the 2nd PPDU received
At least one or more than one combination in condition.
10. the communication node as described in above-mentioned claim 7-9 any claims, it is characterised in that
The PPDU of the 802.11ax forms includes the control such as data frame, RTS or CTS or Trigger Frame
Frame or management frame processed；The PPDU of the Legacy forms includes RTS or CTS or Trigger frame
Deng control frame or management frame.
11. the communication node as described in above-mentioned claim 7-10 any claims, it is characterised in that
First PPDU and the 2nd OBSSs of the PPDU from communication node described in WLAN.
12. STA or AP as described in above-mentioned claim 7-11 any claims, it is characterised in that
The current NAV can be the communication node for coming from local BSS, and, the communication
All OBSS of node PPDU and set or for coming from the communication node
All OBSS PPDU and set, can also be for come from the communication node some
Or a certain group of OBSS PPDU and set.
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